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.` <br />• 5. 1979 ALKALI SAGEBRUSH PRODUCTION <br />The t-test should not be performed since an adequate sample has not been <br />obtained from the reference area. <br />10 <br />6. 1979 BIG SAGEBRUSH PRODUCTION <br />The t-test comparison should not be made since an adequate sample was not <br />obtained from the permit area. <br />7. 1980 BIG SAGEBRUSH PRODUCTION <br />The applicant has utilized the wrong critical t value which has affected the <br />outcome. A critical t of 2.012 (d.f. = 47, (2), p=.05) should have been <br />utilized. The permit and reference areas are not equivalent at the 95% level. <br />8. 1980 ALKALI SAGEBRUSH PRODUCTION <br />The t-test cannot be legitimately performed since adequate samples were not <br />obtained from permit or reference areas. <br />9. 1980 BIG SAGEBRUSH WOODY PLANT DENSITY <br />The t-test comparison cannoC be performed since adequate samples were not <br />obtained for permit or reference areas. <br />10. 1980 ALKALI SAGEBRUSH WOODY PLANT DENSITY <br />The t-test comparison. cannot be performed since adecju.ate samples were not: <br />obtained for permit or reference areas. <br />• 4.15.7(4)(b) <br />Wyoming Fuel has misstated the null hypothesis for the t-test that will be <br />l$pplied if reclaimed area mean values are less than weighted reference area mean <br />~balues. The null hypothesis should read: <br />e H,,: reclaimed area R (given parameter) = reference area x (given parameter). <br />o-J If this hypothesis is accepted at the appropriate confidence level (90% herbaceous, <br />80% woody) then reclamation is considered successful. Wyoming fuel has not <br />addressed to success standards for woody plant density,. <br />4.15.8 Reveeetation: Success Criteria <br />iJ~w]T The` ange of Shannon-Weaver Index values proposed to evaluate plant community <br />~J density do not assure a diverse cover. The applicant has the option of leaving <br />open the diversity index question at this time, in which case a proper method of <br />utilizing diversity indices will be determined by the Division; or propose more <br />stringent success,.criteria for post-mining plant community diversity. <br />C ~• ~ . <br />~' R 7Tl[. ~ / ~~i 4.t.ClLa1, .~°~~L~ :1~1 ./l:'~~P~r. :6 C/p t'1 <br />r`.V/ <br /> <br /> <br />